Q:

Vasoconstriction and vasodilation of blood vessels is facilitated by the

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Vasoconstriction and vasodilation of blood vessels is facilitated by the


  1. elastic fibres in vessel walls
  2. parasympathetic division of the nervous system
  3. smooth muscle in vessel walls
  4. tunica intima of the blood vessel

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C: Contraction and relaxation of smooth muscle produces constriction and dilation of blood vessels. This is under the control of the sympathetic nervous system.

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